Re: [csswg-drafts] [css-view-transitions-2] [scoped] Should the scope have contain:v-t by default? (#12321)

To be clear, `contain: view-transition` is already part of the Scoped View Transitions proposal (see [explainer](https://github.com/WICG/view-transitions/blob/main/scoped-transitions.md#tag-containment) at "Tag containment").

I am strongly opposed to launching Scoped View Transitions without supporting `contain: view-transition`, because that would defeat the goal of enabling composition of encapsulated components.  Developers need to be able to choose tags for their participants without worrying about conflicts with ancestor components they don't know about.

This issue was about whether to auto-apply `contain: view-transition` to actively transitioning scopes, in case the developer forgets to set it.

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Received on Tuesday, 18 November 2025 19:23:12 UTC